Nucleic Acids Research, 1990, Vol. 18, No. 22 6503-6508
© 1990
GENOME STRUCTURE AND MAPPING |
A novel repeated DNA sequence located in the intergenic regions of bacterial chromosomes
Department of Genetics, University of Nottingham, Medical School, Queens Medical Centre Nottingham, NG7 2UH, UK
Received September 10, 1990. Accepted October 16, 1990.
We report the discovery of a novel group of highly conserved DNA sequences located within the intergenic regions of the chromosomes of Escherichia coll, Salmonella typhimurium and other bacteria. These intergenic repeat units (IRUs) are 124–127 nucleotides long and have the potential to form stable stem-loop structures. The location of these sequences within the intergenic regions is variable with respect to known or putative signals for transcription and translation of the flanking genes. Some of the IRU sequences are transcribed, others are probably not. The structure and possible functions of these sequences are discussed in relation to palindromic units and other repeated DNA sequences in bacteria.
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